Corrosion preventing agent



Patented Mar. 14, 194} 2,344,404

UNITED STATES PATENT OFFICE 2,344,404 CORROSION PREVENTING AGENT Franz Glloy, Dessan, Germany; vested in the Allen Property Custodian No Drawing. Almllcafloh October 17, 1940, Serial No.-361,581. In Germany October 21, 1939 This invention relates to corrosion preventing it amounts to 0.01- percent and more related agents and particularly to protecting metals to the water.

against corrosion by water. A further object of The anticorrosive effect is obtained not only in the invention is to protect; metals against corrowater but also in water containing fluids and solusion by water containing fluids and solutions. 5 tions having a pH value of 6 5 or more. Thereof iron, iron alloys or steel occurring in the presand which may act in a certain extent corroding ence of water, water containing fluids and solusuch as acetone, methanol, ethanol, butanol, tions with a pH value lying not below 6.5 is pre- 10 glycerine and the like, as well a aqueous metal vented -by adding to said liquids the water soluble salt solutions such as solutions of ammonium salts of ether carboxylic acids of the general forchloride, calcium chloride or acetate of alumina. mula (R.O.).R.COOH. In this general formula Furthermore the water may contain known disleast 4 carbon atoms which may also be cyclically acid-dodecylamide-chlorobenzylate, piperidinearranged and which may be interrupted by hetero acetic acid-dodecylester-chlorobenzylate, diatoms or hetero atom groups, whereas R means methyl-dodecyl-benzyl-ammcnium-chlorlde, di-

an alkylene radical which may also be substituted methyl-dodecyl-amino-acetate, 4-isooctylphenoland :c the numbers 1 or 2. dimethyl-amino-ethyl-ether-chloro-benzylate.

Ether carboxylic acids of this kind are, e. g., The aforedescribed corrosion preventing agents butyloxyacetic acid, i-amyloxy acetic acid, mixmay also be applied in combination witn other tures of alkoxy acetic acids obtainable from mixknown and equally efiicient agents such as chrotures of alcohols obtainedby reduction of first mates, nitrites or triazotates.

running acids of the para-11in oxidation or ob- The corrosion preventing agents are used for tained as high boiling portions at the methanol water or any water containing fluids or solutions synthesis, octyloxy acetic acid, doclecyloxy acetic which are in contact with metals particularly iron ac1d, cyclohexyloxy acet1c ac1d, tetrahydrofuror iron articles such as water containing fluids furyloxy acetic ac1d phenox acetic acid cresoxy and fluld mixtures for technical apparatuses as acetic ac1d aryloxy fatty acids alkylated or cyclogas meters, aqueous systems of heating and reacid, tetrahydromenaphthyloxy acetic acid, dibreak and pressure devices, for shock absorbers, ctyloxy acetic acid, aheptyloxy propionic acid, driving gears and the like. Furthermore the i-octyloxy propionic acid, -octyloxy-iso-butyric anticorrosive agents can be added to water con- LCid, a-octYlOXY capric acid an the like. Furtaming fluids for cleaning and preserving razor hermore alkoxy fatty acids maybe used, which ar t s razor blades and medical instrure obtained from secondary alcohols by conments. Finally the agents y be used for p eperting with halogen fatty acids, th alcohols arations for working metals such as aqueous oil 1g obtained from the first running acids of the f i boring cutting meta-1S, lu i a araflin oxidation with 7 to 9 carbon atoms by 40 mg emulsions and the llkeetonizing and subsequent hydrogenizing or such Example 1 [koxy fatty acids which f obtamed by react In a 1% aqueous solution of piperidino-acetic Lg alcoholates of the primary alcohols C7Ca acjdmdo decy1 ester ch1 or obenzylate containing ith a-halogen fatty acids such as a-butoxylauric moreover 3 to 4% of the ammonium salts of a fi'hydroxyimhgxyloxy' acepc acidmethoxy' mixture of alkoxy acetic acids the alkyl groups 'hexyloxy acepm i and the like ,Among these of which have 7 to 9 carbon atoms, any metallic her carboxylic acids the alkoxy and cycloal- Xy fatty acids are to be preferred.

In aqueous solution the salts of those acids rich maybe formed with alkali, earth alkali and ."th metals, ammonia or organic bases prevent ready within a few hours a corrosion of metals particularly of H011, iron oys and steel and of articles made thereof. The Example 2 lcentration of the salts of the ether carboxylic v 67 parts by weight of a mineral oil are mixed ds in the water may vary within wide limits, while stirring with 33 parts by weight of the ammonium salt or the butoxy acetic acid, whereupon 4 parts by weight of ammonia (25%) are is stirred until a clear suspension is obtained. 2 parts by weight of this mixture are stirred in 100 parts of water forming a rust preventing emulsion which may be used as lubricating and boring oil.

I claim:

1. A composition substantially non-corrosive to metals comprising a solution of a small amount of a salt 0! an ether carboxylic acid in water containing metal corroding materials, said solution having a pH oi'at least 6.5.

2. A composition substantially non-corrosive to metals comprising a solution of a metal corroding disinfectant and a salt of an ether carboxylic acid in water, said solution having a pH of at least 6.5.

3. A process for preventing the corrosion of a metal in contact with a fluid containing water which comprises adding to said fluid a small salt or an ether carboxyiic acid to said soluamount of a form an aqueous solution oi! said salt. tion having a pH of at least 6.5.

4. An aqueous solution substantially non-corrosive to metals containing a disinfecting agent and a salt of an alkoxy acetic acid. the alkoxy group containing from '7 to 9 carbon atoms, the solution having a pH of at least 6.5.

5. A process for minimizing the corrosion of a metal in contact with a fluid containing water and a mineral oil which comprises adding to said fluid a salt or butoxy acetic acid, said fluid having a pH of at least 6.5.

6. A process for minimizing the corrosion of a metal containing iron when in contact with water containing impurities leaving a pH of at least 6.5 which comprises adding to the water a small amount of a salt of an alkoxy acetic acid containing at least 4 carbon atoms in the alkyl group.

FRANZ GILOY. 

